A double gobo rotator will provide a much better effect for water. So will a scene machine rotator wheel, ripple machine, moving light having gobos that can rotate against each other, and even as I just inherited to care taker over a scene projector that also has various water scrollers. Given the Linenbacher projectors (scene machines) of recent look at, they use the same technology as a scroller to make water. Something one can possibly make for use on a scroller roll.i guess i'm hoping for way to much if i as if there is some sort of nautical effect to be achieved with a gobo rotator. in order to justify a purchase it needs to be useful for a wider range of things then just one effect. i'm going to try the reflecting water thing. does the tray need to reflective on the bottom?